Choosing a home sauna is a sequence of six decisions, and they have to be made in order: how many people it seats, whether it goes indoors or outdoors, what type of heat you want, what wood it is built from, what heater the cabin needs, and how it will physically get to the spot it will live in. Settle those six and the shortlist usually narrows to two or three cabins.
Work through this guide as a checklist before you order. The expensive mistakes in home saunas are almost never about the cabin itself. They are about a doorway that was too narrow, a pad that was never poured, or an electrical supply nobody asked about until delivery day.
1. How to choose a home sauna size: count people, not square footage
Sauna capacity is quoted in people, and the quoted number assumes everyone is sitting upright with their feet down. If you want anyone to be able to lie out on the upper bench, you need a cabin whose bench length is longer than the tallest person who will use it, which usually means moving up at least one size.
A useful way to sanity-check capacity:
- Decide the realistic maximum number of people at one time, then add one seat.
- Check whether anyone needs to recline. If yes, check the bench length, not the person count.
- Check bench depth if you want to sit cross-legged rather than perched.
- Check interior height, because in a traditional cabin the upper bench is where the heat is and your head needs to be clear of the ceiling when you sit on it.
Oversizing has a cost. A larger cabin needs a larger heater, draws more power and takes longer to come up to temperature. Buying two sizes bigger than you need is not future-proofing, it is a permanently slower warm-up.
2. Decide indoors or outdoors before anything else
This decision changes the cabin, not just the location, so make it first.
An indoor sauna has to fit through your doors and up or down your stairs, has to sit on a floor that can take the loaded weight, and has to vent somewhere sensible. In exchange it needs no weatherproofing and no foundation.
An outdoor sauna needs a level, well-drained base, an exterior-rated shell and roof, and a route for the electrical supply out to it. Barrel saunas and outdoor cabin saunas are built for this. The shape of a barrel is not just styling: the curved interior means less air volume to heat for the same bench space, and the round profile sheds rain and snow.
Questions that decide it for you
- Is there a room indoors with the floor area, the ceiling height and the access to get a cabin into it?
- Is there a spot outdoors that is level, drains away from the cabin and is not directly under heavy tree litter?
- How far is that spot from the electrical panel? Distance is a real cost line on an outdoor install.
- Will you use it in winter? Walking twenty yards through snow is fine for some people and the end of the habit for others.
3. Choose the type of heat
There are three broad systems, and they are not interchangeable.
A traditional sauna with an electric heater and stones gives you high air temperature and the option of pouring water on the stones for a short burst of humidity. A wood-burning traditional sauna gives the same heat character without an electrical heater, in exchange for a flue, clearances, fuel and ash.
An infrared sauna uses radiant panels instead of heated air. The cabin runs cooler, warms up faster and is usually a smaller installation.
A steam room is a different animal again: a sealed, fully waterproofed enclosure fed by a steam generator, producing dense humidity rather than dry heat. If that is the direction you are leaning, the sizing exercise is about generator capacity and enclosure volume rather than bench count.
4. Understand the wood types
Sauna wood is selected for how it behaves under repeated heat and humidity cycling, not for looks alone. The qualities that matter are dimensional stability, resistance to warping and splitting, low resin content so it does not weep, and a low tendency to get painfully hot to the touch.
- Western red cedar. The common premium choice for both interiors and exteriors. Stable, light, low resin, with a strong aroma when hot.
- Hemlock. Smooth, pale, close-grained and largely odorless, which suits anyone who finds cedar's scent too strong. Generally an indoor choice.
- Nordic spruce. The classic Northern European sauna wood, pale with visible knots, long used for cabin interiors.
- Thermally modified woods. Timber heat-treated to improve stability and moisture resistance, usually darker in color as a result.
Two practical points. Interior benches and backrests should be a wood that stays comfortable to sit on at temperature, and interior wood is left unsealed, because varnish and sealers do not belong inside a hot cabin. Exterior surfaces are a separate specification from interior ones.
5. Match the heater to the cabin
Heater sizing is driven by the interior volume of the cabin, adjusted upward for anything that bleeds heat: glass doors and windows, uninsulated walls, exposed masonry or stone inside the room, and high ceilings. A cabin with a large glass front needs more heater than the same cabin in solid timber.
Three rules worth holding on to:
- Use the manufacturer's sizing guidance for that specific cabin and heater pairing, not a general rule of thumb.
- Do not undersize to save on the electrical supply. An undersized heater runs constantly and never comfortably reaches its set point.
- Confirm the heater guard and clearance requirements fit your layout before you buy, because they dictate how close benches and walls can be.
Heaters and steam generators are hard-wired appliances with genuine power requirements. The circuit, the breaker and the supply run are work for a licensed electrician, any plumbing or gas work is for a licensed plumber or gas fitter, and your local permit and code requirements decide what is allowed at all. Get those answers before ordering, not after.
6. Plan delivery and assembly before you click buy
This is the step people skip. Saunas arrive as large, heavy, flat-packed or pre-built sections on a pallet, usually on a curbside delivery.
- Measure the full route: gate, path, doorways, corners, stairs, and any turn radius a long panel has to make.
- Confirm who moves the pallet from the curb to the site, and whether you need help or equipment for it.
- Check whether the model is a kit you assemble or a pre-built cabin that is placed.
- For an outdoor unit, have the pad or foundation ready before the delivery date, not after.
- Read the assembly documentation ahead of time so you know how many people it takes.
How to choose a home sauna: the final pre-order checklist
Use this as your final pre-order checklist:
- Capacity confirmed against the tallest and most numerous realistic session
- Indoor or outdoor decided, and the exact spot chosen
- Heat type chosen: traditional electric, wood-burning, infrared or steam
- Wood specification understood for both interior and exterior
- Heater or generator sized to the cabin by the manufacturer's guidance
- Licensed electrician consulted on the supply, and permits checked locally
- Delivery route measured and the base or floor ready
- Clearances around the heater and walls confirmed against the layout
One general note on heat. Heat exposure is not suitable for everyone. Keep sessions short, stay hydrated, keep alcohol out of the cabin, and supervise children and older adults. Anyone who is pregnant, has a heart condition, has low or high blood pressure, or takes medication should ask their doctor before using a sauna or steam room.
Once you know your six answers, the shortlist is short. If you want help matching those answers to a specific cabin and heater pairing, get in touch through the Contact page.